Downdraft fire-box.



sym. VAUGLAIN & G. R. HENDERSON.,

DOWNDRAPT FIRE BOX. h v.APPLICATION FILED SEPT. 8,.'1911. 1,028,642, jPatented June-4, 1912.

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COLUMBIA PLANOGRAPH C0.,WASH!NGTON. n. c.

s. M.` VAUGLAIN a; G., R. HENDERSON.

v DOWNDRPT PIRE BOX. Y APPLUATION FILED SEPT, B, 1911.

Patented June 4, 1912.

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v www' COLUMBIA PLANoaRAPH C0.. WASHINGTON. D. C.

' TINTTED sTATEs PATENT OFFICE.

sAIvIEI. IvI. vAUOLAIN AND GEORGE E. lHE'NDEEsOmOE PHILADELPHIA,PENNSYL- VANIA, AssIGNOEs-'TO THE BALDWIN LocoMOTIvE WOEKs, OPPHILADELPHIA, PENNSYLVANIA, A CORPORATION OP PENNSYLVANIA.

DOWNDRAFT FIRE-BOX.

Specification of Letters Patent.

Patented June 4., 1912.

T0 all whom z5 man] concern.'

Be it known that we, SAMUEL M. VAU- OLAIN and GEORGE R. HENDERSON,citizens of the United States, residing in Philadelphia, county ofPhiladelphia, State of Pennsylvania, have invented certain Improvementsin Downdraft Fire-Boxes, of which the following is a specification.

The object of thisinvention 'isto secure the combustion of bituminouscoal without the usual generation and expulsion of smoke from the stack.

The construction is particularly adapted for use in locomotive boilers.

In the accompanying drawing-Figure 1, is a longitudinal sectional viewof a locomotive boiler illustrating our invention, on the line 1-1 Fig.2; Fig. 2, is a transverse sectional view on the line 2-2, Fig. 1;looking toward the rear of the fire box; Fig. 3, is a longitudinalsectional view illustrating a modification of the invention; and

Fig. 4, is a sectional view of a detail of the construction illustratedin Fig. 3.

A is a ire box which may be of any of the ordinary constructions.

B is the body ofthe boiler, in which are the tubes b.

In place of the grate which is usually located at the bottom of the irebox of. locomotives of the coal burning type, the grate is formed by aseries of water tubes arranged preferably at the incline shown, andthese tubes are set and expanded into the crown sheet a of the re boxand into the walls of a water partition B at the bottom of the re boxnear the rear end. rlhis water partition communicates with the sidewater space between the re boxand the casing of the boiler. The upperends c of the grate tubes C are preferably bent so as to assume avertical position some distance below the crown sheet a and they arepreferably staggered as shown so as to receive and properly hold thedeflector E, which is made of a series of fire bricks. These bricks arefor the purpose of preventing the products of combustion from passingover the top of the coal.

b is a re door through which the coal is shoveled onto the water tubegrate C.

There is a space F formed between the partition B and the rear wall ofthe fire box, and the lower portion of this space or compartment isclosed by a hopper F having a door j". 'At the upper end of this spaceor compartment is a trap door f hinged as shown. On lowering the trapdoor any clinkers or large portions of burned coal may be readilyremoved from the surface of the grate and discharged into thecompartment F without permitting air to enter at this portion of the rebox.

The ash pan G has a Hoor g preferably lined with fire brick, and at therear end of the ash pan is a compartment g into which the small ashes orcinders can be blown by means of the jet pipe 7c which extends throughan opening in the forward end of the ashpan, as clearly shown in Fig. 1.

Below the ioor g of the ash pan is apassage i which communicates withthe chamber I through passages at each side of the compartment g. At theforward end of the passage z' is a `damper z" suitably pivoted, and inthe front wall of the chamber I is a seriesof openings 2 for the escapeof air into the combustion chamber under the grate C. By regulating theopening of the damper z" more or less air will iiow through the chamberI and under the fire brick lining and lwill be heated to a certainextent by contact with the under surface of the fire brick or thepartition, and'will escape eventually through the passages 2 into thecombustion chamber and mingle with the gases that are distilled from thehot under bed of the coal, and thus form complete combustion in thechamber A before passing to the tubes of the boiler.

We may in some instances use the con,- struction illustrated in Fig. 3,in which the grate C is composed of tubes connected to transverse drumsN, N, N2. The transverse drum N may rest upon the structure at the rearof the re box in such position as to separate the compartment F2 fromthe combustion chamber of the fire box, and the two transverse drums Nand N2 may be so located as to properly support the fire brick delectorE as clearly illustrated in Fig. 3. These drums preferably extendthrough both walls of the fire box as indicated in Fig. 4, and areprovided with suitable caps n and they are perforated at n so as tocommunicate with the connecting space between the walls of the lire boxand the casing of the boiler so that when it is desired to clean Thechamber I directly under the drum N is closed by a damperk Sand thereare in-V clined openings 4 1n the front wall which communicate with thecombustion Chamber A.

this door the small ashes or cinders can be readily blown from thesurface of the fire brick bottom g of the ash pan by means of 'the steamdischarged through the nozzle 7c.

By this invention the usual method of tiring a locomotive is'V notdeparted from, as the ire door is practically in the same position as inthe ordinary locomotive and the grate instead of being at the base ofthe re box is raised a suflicient distance, and is at such an incline,that it will properly hold the body of coal and the fireman can quicklysee the condition of his fire at all times, and can regulate the draftsaccordingly.

We claim:'

1.- The combination in a locomotive of a tire box; a series of tubescommunicating with the lire box; a water partition extend-v ing acrossthe lower end ofthe hre box some distance Yfrom the rear end thereof,forming a chamber, with series of inclined tubes exte-:riding from thewater partition to the crown sheet of the fire box.

2. The combination in a boiler of a fire box; a transverse waterpartition at the lower end of the tire box some distance from the rearend thereof; a series of tubular grate bars connected to the saidpartition and to the crown sheet of the boiler, said tubes communicatingwith the water space of the boiler; and a transverse partition attheupper end of the grate to prevent products of combustion from passingover the grate into the combustion chamber.

There iS also a hinged door g2 at the rear of the ash pan G so that inopeningV V3. The combination in a boiler of a fire box; a transversewater partition at the lower end of the fire box located some distancefrom the end thereof; a Series of water tubes forming a grate, saidwater tubes communicating at the lower end with the waterpartition andhaving vertical portions coupled to the crown sheet of the hre box andcommunicating with the water space of the boiler, the vertical portionsof said tubes being staggered, with lire brickv sections h'eld in placeby the 'tubes and forming a partition preventing the passage of theproducts of combustion over the forward end of the grate. i

4. The combination in a boiler, of a fire box; a transverse waterpartitionA in the lower portion of the fire box some distance from therear end'thereof and forming a clean out space; a series of inclinedwater tubes forming a grate andconneeted to said partition and with theAcrown sheet of the lire box; a hopper at the lower end of the clean outspace'having a door; and a trap door at the upper end of said space, sothat when the trap door is' opened the clin'lrers and large portions ofburned coal may be re- ,moved from the surface ofthe grate anddischarged into the hopper.

5. The combination of a locomotive iire box having a crown sheet abovethe tubes of the boiler; with a series of inclined tubular grateslocated within the fire box, one end of said tubes being bent up andattached to the crown sheet Vof the boiler and the other end attached tothe boiler at the rear end of the fire box.

In testimony whereof, we have signed our names to this specification, inthe presence of two subscribing witnesses.

Vitnesses:

LOUIS H. BENDER, J. H. KERST.

Gopiers of thisfpatentmaybe obtainedrforr ve cents each, by addressingthe Commissioner of IE'atents, Washington, D. C.

